ZHA Multiple Co-ordinators

Being able to add multiple co-ordinators to a ZHA integration would be really useful.

This could be implemented as a configuration point on an existing ZHA integration, or allow for multiple instances of the ZHA integration, with a co-ordinator for each one.

This would be a benefit for many people, especially those in large properties who are unable to stretch the network across it fully.

https://github.com/zigpy/zigpy/discussions/673

https://community.home-assistant.io/t/zha-support-for-more-than-one-zigbee-coordinator-in-zha/258248

https://community.home-assistant.io/t/zha-multiple-gateway/262101/